Karbid k\u0159em\u00edku je pru\u017en\u00fd, pevn\u00fd, oxidaci odoln\u00fd keramick\u00fd materi\u00e1l s n\u00edzkou hustotou, kter\u00fd se pou\u017e\u00edv\u00e1 v prost\u0159ed\u00ed s vysokou teplotou k vyztu\u017een\u00ed kompozitn\u00edch materi\u00e1l\u016f.<\/p>\n
Uhl\u00edkov\u00e9 nanotrubi\u010dky si d\u00edky sv\u00fdm v\u00fdjime\u010dn\u00fdm vlastnostem v extr\u00e9mn\u00edch teplotn\u00edch podm\u00ednk\u00e1ch z\u00edskaly velkou pozornost v leteck\u00e9m a vojensk\u00e9m pr\u016fmyslu a v\u00fdrob\u011b zbran\u00ed a vybaven\u00ed. Krom\u011b toho lze tyto materi\u00e1ly pou\u017e\u00edt tak\u00e9 ke zpevn\u011bn\u00ed kompozit\u016f s keramickou matric\u00ed.<\/p>\n
Vl\u00e1kna karbidu k\u0159em\u00edku jsou atraktivn\u00ed volbou materi\u00e1lu pro vysokoteplotn\u00ed konstruk\u010dn\u00ed aplikace d\u00edky kombinaci vysok\u00e9 specifick\u00e9 pevnosti, n\u00edzk\u00e9 tepeln\u00e9 rozta\u017enosti a vynikaj\u00edc\u00ed odolnosti proti opot\u0159eben\u00ed. Karbid k\u0159em\u00edku lze pou\u017e\u00edt k vyztu\u017een\u00ed kompozit\u016f s kovovou matric\u00ed s vynikaj\u00edc\u00ed tepelnou stabilitou a elektrickou vodivost\u00ed.<\/p>\n
Vl\u00e1kna karbidu k\u0159em\u00edku se rovn\u011b\u017e vyzna\u010duj\u00ed vynikaj\u00edc\u00ed odolnost\u00ed proti oxidaci a snadnou p\u0159\u00edpravou, co\u017e z nich \u010din\u00ed vynikaj\u00edc\u00ed alternativu k vl\u00e1kn\u016fm boru pro mnoho aplikac\u00ed. Krom\u011b toho jsou karbidov\u00e1 vl\u00e1kna k\u0159em\u00edku ide\u00e1ln\u00edm kandid\u00e1tem pro vysokorychlostn\u00ed mechanick\u00e9 aplikace, jako jsou leteck\u00e9 a kosmick\u00e9 konstrukce nebo konstrukce bezpilotn\u00edch letadel (UAV).<\/p>\n
V t\u00e9to studii jsme vyvinuli nov\u00fd postup pro vytvo\u0159en\u00ed neoxidativn\u00edch vl\u00e1ken karbidu k\u0159em\u00edku vhodn\u00fdch pro vysokoteplotn\u00ed aplikace pomoc\u00ed pyrol\u00fdzy polykarbosilanov\u00e9ho prekurzoru. Vyroben\u00e1 vl\u00e1kna byla hodnocena pomoc\u00ed skenovac\u00ed elektronov\u00e9 mikroskopie a rentgenov\u00e9 difrak\u010dn\u00ed anal\u00fdzy; nepravideln\u011b tvarovan\u00e9 \u010d\u00e1stice SiC pr\u00e1\u0161ku slou\u017eily jako v\u00fdchoz\u00ed materi\u00e1l pro v\u00fdrobu tkan\u00fdch kompozit\u016f z karbidu k\u0159em\u00edku vyztu\u017een\u00fdch vl\u00e1kny s keramickou matric\u00ed pomoc\u00ed technologie binder jetting; jejich zhu\u0161\u0165ovac\u00ed chov\u00e1n\u00ed a mikrostruktura byly hodnoceny prost\u0159ednictv\u00edm \u0161esti cykl\u016f infiltrace\/pyrol\u00fdzy polymeru.<\/p>\n
Vl\u00e1kna karbidu k\u0159em\u00edku jsou d\u00edky sv\u00e9 v\u00fdjime\u010dn\u00e9 tepeln\u00e9 odolnosti a dal\u0161\u00edm vlastnostem ji\u017e dlouho vyu\u017e\u00edv\u00e1na odborn\u00edky v leteck\u00e9m pr\u016fmyslu, tak\u017ee jsou obl\u00edben\u00fdmi sou\u010d\u00e1stmi pou\u017e\u00edvan\u00fdmi v leteck\u00fdch motorech a syst\u00e9mech tepeln\u00e9ho \u0159\u00edzen\u00ed. Karbid k\u0159em\u00edku zpev\u0148uje kompozity s keramickou matric\u00ed (CMC) pro pou\u017eit\u00ed v t\u011bchto motorech nebo syst\u00e9mech - maj\u00ed t\u0159etinovou hustotu oproti sou\u010d\u00e1stem ze slitin niklu a z\u00e1rove\u0148 sni\u017euj\u00ed celkovou hmotnost letadla t\u00edm, \u017ee sni\u017euj\u00ed celkovou hustotu.<\/p>\n
(Mikro)mechanick\u00e1 za\u0159\u00edzen\u00ed MEMS kombinuj\u00ed mechanick\u00e9 aktu\u00e1tory nebo senzory s integrovan\u00fdmi elektronick\u00fdmi obvody pro zv\u00fd\u0161en\u00ed funk\u010dnosti, v\u010detn\u011b sn\u00edma\u010d\u016f tlaku, akcelerometr\u016f, termo\u010dl\u00e1nk\u016f a piezoelektrick\u00fdch gener\u00e1tor\u016f. Vl\u00e1kna z karbidu k\u0159em\u00edku lze tak\u00e9 spl\u00e9tat do mikrostrukturn\u00edch MEMS pro dosa\u017een\u00ed vynikaj\u00edc\u00edch mechanick\u00fdch a chemick\u00fdch vlastnost\u00ed i p\u0159i extr\u00e9mn\u00edch teplot\u00e1ch.<\/p>\n
P\u0159edpokl\u00e1d\u00e1 se, \u017ee severoamerick\u00e9 trhy budou m\u00edt vedouc\u00ed postaven\u00ed na sv\u011btov\u00e9m trhu s vl\u00e1kny karbidu k\u0159em\u00edku, pokud jde o r\u016fst, v d\u016fsledku rostouc\u00ed aktivity v oblasti v\u00fdroby leteck\u00e9 a vojensk\u00e9 techniky. P\u0159edpokl\u00e1d\u00e1 se, \u017ee rostouc\u00ed v\u00fddaje na obranu a financov\u00e1n\u00ed NASA rovn\u011b\u017e zv\u00fd\u0161\u00ed popt\u00e1vku po vl\u00e1knech z karbidu k\u0159em\u00edku; nav\u00edc jejich pou\u017eit\u00ed v za\u0159\u00edzen\u00edch pro nap\u00e1jen\u00ed elektromobil\u016f m\u00e1 schopnost prodlou\u017eit dojezdovou vzd\u00e1lenost p\u0159i sou\u010dasn\u00e9m sn\u00ed\u017een\u00ed energetick\u00fdch ztr\u00e1t baterie a velikosti komponent, co\u017e zvy\u0161uje \u00fa\u010dinnost syst\u00e9mu.<\/p>\n
Vl\u00e1kna z karbidu k\u0159em\u00edku jsou vhodn\u00e1 pro aplikace n\u00e1ro\u010dn\u00e9 na v\u00fdkon, nab\u00edzej\u00ed vysokou vodivost a pevnost p\u0159i n\u00edzk\u00e9 tepeln\u00e9 rozta\u017enosti. Jejich kombinace z nich \u010din\u00ed ide\u00e1ln\u00ed materi\u00e1l pro vysokonap\u011b\u0165ov\u00e9 elektrick\u00e9 komponenty a pro aplikace p\u0159enosu a distribuce energie.<\/p>\n
D\u00edky sv\u00e9 schopnosti odol\u00e1vat oxidaci jsou ide\u00e1ln\u00ed pro pou\u017eit\u00ed p\u0159i v\u00fdrob\u011b kompozit\u016f s keramickou matric\u00ed, kter\u00e9 se hojn\u011b vyu\u017e\u00edvaj\u00ed p\u0159i v\u00fdrob\u011b palivov\u00fdch obal\u016f jadern\u00fdch reaktor\u016f, je\u017e odol\u00e1vaj\u00ed extr\u00e9mn\u00edm teplot\u00e1m, tak\u017ee popt\u00e1vka po t\u011bchto vl\u00e1knech \u010dasem pravd\u011bpodobn\u011b v\u00fdrazn\u011b vzroste.<\/p>\n
O\u010dek\u00e1v\u00e1 se, \u017ee leteck\u00fd a kosmick\u00fd pr\u016fmysl bude hnac\u00ed silou r\u016fstu trhu s vl\u00e1kny karbidu k\u0159em\u00edku d\u00edky rostouc\u00edm v\u00fddaj\u016fm na obranu a rostouc\u00edm dod\u00e1vk\u00e1m komer\u010dn\u00edch letadel ve Spojen\u00fdch st\u00e1tech. Krom\u011b toho m\u016f\u017ee zv\u00fd\u0161en\u00e9 financov\u00e1n\u00ed NASA a v\u00fddaje na obranu zv\u00fd\u0161it popt\u00e1vku po titanov\u00fdch, hlin\u00edkov\u00fdch a keramick\u00fdch kompozitn\u00edch v\u00fdrobc\u00edch v Americe d\u00edky jejich schopnosti pracovat v prost\u0159ed\u00ed s vysokou teplotou.<\/p>\n
Vl\u00e1kna karbidu k\u0159em\u00edku jsou \u0161iroce vyu\u017e\u00edv\u00e1na pro v\u00fdrobu kompozit\u016f s keramickou matric\u00ed a jako alternativa superslitin na b\u00e1zi niklu p\u0159i v\u00fdrob\u011b leteck\u00fdch komponent\u016f. Krom\u011b toho se karbid k\u0159em\u00edku d\u00edky sv\u00fdm radia\u010dn\u011b odoln\u00fdm vlastnostem st\u00e1v\u00e1 st\u00e1le obl\u00edben\u011bj\u0161\u00edm v energetick\u00e9m pr\u016fmyslu pro keramick\u00e9 obklady a struktury aktivn\u00ed z\u00f3ny jadern\u00fdch reaktor\u016f.<\/p>\n
Vysok\u00e1 teplotn\u00ed stabilita a chemick\u00e1 inertnost \u010din\u00ed z oxidu hlinit\u00e9ho vynikaj\u00edc\u00ed materi\u00e1l pro vyztu\u017eov\u00e1n\u00ed vysokoteplotn\u00edch kompozit\u016f, proto\u017ee si zachov\u00e1v\u00e1 pevnost i p\u0159i vy\u0161\u0161\u00edch teplot\u00e1ch. Jeho pevnost v tahu nav\u00edc zaji\u0161\u0165uje mechanick\u00e9 vlastnosti bez zv\u00fd\u0161en\u00ed hmotnosti - co\u017e je neoceniteln\u00e1 vlastnost pro aplikace citliv\u00e9 na hmotnost, jako je automobilov\u00fd a leteck\u00fd pr\u016fmysl.<\/p>\n
Tkan\u00e1 vl\u00e1kna karbidu k\u0159em\u00edku jsou \u0161iroce vyu\u017e\u00edv\u00e1na v kovov\u00fdrob\u011b jako izola\u010dn\u00ed materi\u00e1l a v\u00fdztu\u017e \u017e\u00e1ruvzdorn\u00fdch materi\u00e1l\u016f, jako je oxid k\u0159emi\u010dit\u00fd, oxid hlinit\u00fd a nitrid hlin\u00edku. Krom\u011b toho jsou d\u00edky n\u00edzk\u00e9mu obsahu kysl\u00edku vhodn\u00e1 pro pou\u017eit\u00ed v plynov\u00fdch turb\u00edn\u00e1ch, a to d\u00edky vy\u0161\u0161\u00edm teplot\u00e1m, kter\u00fdm jsou schopna odol\u00e1vat.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide fiber is a flexible, strong, oxidation resistant and low density ceramic material used in high temperature environments to reinforce composite materials. Due to its exceptional performance under extreme temperature conditions, carbon nanotubes have garnered wide attention in both aerospace and military weapons and equipment industries. Furthermore, these materials can also be used to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[64],"tags":[],"class_list":["post-176","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/176","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/comments?post=176"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/176\/revisions"}],"predecessor-version":[{"id":177,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/176\/revisions\/177"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/media?parent=176"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/categories?post=176"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/tags?post=176"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}